MSDN says that <supportedRuntime> configuration element can contain optional attribute sku. I understood totally how to use it, but what is SKU? I mean is it an acronym and if it is, what does it stands for?
SKU stands for Stock Keeping Unit
SKU refers to a stock-keeping unit, a unique identifier for each distinct product and service that can be purchased in business.
Addition info:- You can get the list of all SKU at:-
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319\SKUs